Computing-rule.



E. n. N. SCHULTE.

COMPUTING RULE. v

, APPLICATION FILED APR. 11. 1912.

WI. m w# w h uh m e c n, mS a n 1% I MM J I H v m 1 m w COLUMEIA PMNOGRAPH 50-,WASH1NGTON D C or T OY;- NEW YORK, Assieiron mo'wl a L. E. GURLEY, A

a 1 4conronAcnrono'rfn-nw YORK. v

} v 1SOHULTE, a citizen the United States,'re-

I StatIO't-NrW oljkg'ihavezz-invented cer- -j tain' new. and useful Improvements in Oompi i e-R lesy-of specifica'tion; 1 d a I Thisy-i Yention .r'elatesfto' computing; dey es "and articularly-toga logarithmicrule ither :rejct'ang'ular f'OIfr scylindrical .1. i olum'es sealers fofgxsweights {and measures in esting;

Qllim etric measures."

he accompanying draw} t, "Figure"1*shoWsjthe raduatlonsj 'of that sid or thearuliintefidedJifbr e m a ur s-t ame tio ith ldiame ereoftcyl n r ca m 1d e pf therule intended 'forfthe Ineasurement j: the lthree. dimensio d ng wi b 'the-i oluririe of solid. jIt.

d that-slnce log l 0 if th bass n isolely d ,ndfitionfthe systh .ius i I on base h b devi specificationof Letters Patent.

adapte' to tensed forjthe 'inea'surementiof an'df,particularly;iintendedgiforfthei use of r retina-m ga n inbdyihg {the-t ase i bf the 1- altitude of cylindrical nie'asures =01:

ad snags-t le;

e -units same volume; :From this it follows that the zero-ofa lineal scale for measuringiectang'ular tizolumes-andf'the zero of a lineal ssca'lie for?measuringaltitudes of cylinders 95 {would beplaced the same distanceffrom the end of the ruleand as this distance is the controlling factor in the graduation'it followsthatthe two scales would be identical.

I A further feature of myinvention is the 190 logarithmic'graduationof the rule according v av l volumeof fgpint.

The particular desirabillty .of these: last 1 features arises from the followingfacts;-

" f coiv rumine-mmn.

ofa cylinder with the diameter scale I and its altitude with: the lineal or depth =scalefand adding the twov readings e Will secure the logarithm of the volume of the f solid. To secure thi result however, the I V units of graduation ofthe rtwo scales must wh ch $13116 -following 1s a be'properlycorrelated according to the following principles. v If the unit of volume is o z t0 be for instance apint,-"'a unit which I prefer for reasonsllater to beexplained, [choose-acylinderof thisvolume having any convenient ratio of altitude to jdiameter. r Bemembering that log; 1:f0" it-j is obvious that the"fzero .bf the 11 m cale will be disy the end of the rule by a'n amount 7 equal to the 'altitude'of'the cylinder. and that the zero of the diameter scale Will be distant from a the endiojfvzjthe scale by an amount I equal to the diameter ofthe cylinder. Other system ofqlogarithnisused.

l-leretofore scales "embodying thesegeneral graduations are determined according tothe principles have been made and usedflout the ratio of the altitude to the diameter of the unit volumeflcylinder has been chosen at random and theresult is that the lineal scale is useless except for the measurement;

of thealtitudes'of cylinders in-connection I with its correspondingdiameter scale.

j 5 (.My invention consists inso proportioning the cylindrical unit'volume that the lineal 85,

or depth scale maybe used alsolto measure 7 thethree"dimensions'ofi rectangular meas- I Vu'nes'thusimparting a new and useful funcftioii ofthe rule. "ch00 eia cylindrical unit- Volume" hose altiwas isfeq'ualto the'edgelof a cube of the to a system having such a base that log.2=10,

eter are derivedifrom a cylinder of'the special proportions .above stated havlng a I, v p Patented Ju1 c,1915-. a lieati li'filed s rain, 912. scram. 690,144. 1 v I i 1 of unit, volume and the other series of logaif v rithmi'c graduationsexpressing the l0g'a-' e rithms offcircular areas-measured in terms j prising in combination two lineal measur I h oflineal distances measured in terms o'fithe length of the edge of a cube; of unit volume, and the other series oflogarithmic .graduations ezqor es'sing ithe logarithms ofv circularareas measured in te'rms of; the div ameter of a cylinder of unit volume equal in. altitude to the aforesaid cube.

means for measuringyolumes comm PI'ISIIIgln combinatlon two lineal measuring; 111s elements each having a difi'erent seriesof logarithmic graduations; the logarithmic base-of the, two series being such that log.

2:10, onelseries. of graduations expressing. the logarithms of linealdistances measured s interms of the length of the edge 'o f'a cube 7 Copie s of ethis patent maybe obtained for five cents each, by addressing the Commissioner tenants;

- ofthe diameter ofacylinder of unit volume 2:10; one series of graduations expressing the logarithms of lineal distances measured in terms of the length of theedge of a cube of 'pint volume, and the other series of logarithmic graduations expressingthe logarithms of circular areas measured in terms of the diameter of a cylinder of pint volume equal in altitude to the aforesaid cube.

In testimony whereof I have signed my name to this specification in thepresence of 40 I twos'ubscribing witnesses.

Witnesses: f

' i E. A. HAYNER GORDON S. HOPKINS.

Washington, D. 03- I EDWARD D. sc ULTnj ,e 

